Sharpening device.



A. J. STURM. SHARPBNING DEVICE. APPLIoAIoN'rILBD AUG. 25, 190e.

919,976. Patented Apr. 27, 1909.

WJTNESSES l .NI/ENTOR ALEXANDERJ. STURM, OF STRATFOREWISCONSIN4sHARrnNrive DEVICE.

Specification of Letters Patent.

Patented April 27, 1909.

Application filed August 25, 1908. Serial No. 450,145.

To all 'whom it 'may concern:

Be it known that I, ALEXANDER J STURM, a citizen of the United States,residing at Stratford, in the county of Marathon and State of Wisconsin,have invented certain new and useful Improvements in Sharpening Devices;and I do ereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains -to make and use the same. i

My invention relates to new and useful improvements in sharpeningdevices and more whereby the thickness of the cutting edge may be variedanda still further object is to provide means for securing thesharpening device to a suitable support.

Other objects and advantages will be here-V inafter referred to and moreparticularly pointed out in the claim.

In the accompanying drawings which are made a part of 'this application,the iigure is a erspective view of t e invention.

eferring to the drawings in which similar 4 reference numerals designatecorresponding parts throughout the several views, 1 indicates the baseof my improved sharpening device, said base having vertically extendingend sections 2 and the u per ends of the end sections having inward yextending terminals 3, which terminals are dis osed in a plane above andparallel with t e base l. The meeting ends of the terminals 3 are spacedapartso that a knife or similar object may be introduced between theends of the terminal and into engagement with sharpening plates 4.

The plates 4 are placed edgewise between the terminals 3 and base 1, theloweredges of the plates 4 being entered in a channel plate 5 fixed tothe base 1, while the upper edges thereof are engaged by the lower faceof the terminals 3 and in order to hold the plates 4 in their. fixedositions, binding screws 6 are introduced t rough the terminals 3 andthreaded into the base, said screws, 4when properly adjusted, forcingthe terminals into engagement with the lates 4 with sufficient pressureto lhold the p ates in their adjusted positions.

The side walls of the channel late 5 are inclined, sov that the plates 4may e tilted to various rangles and thereby form cutting edges on thetool of varying thicknesses and in order to cause the terminals topositively engage the upper edges of the plates 4, the meeting edges ofthe terminals are curved, said curvature co-inciding to the swingingradius of the plates 4.

The Sharpener is secured to any suitable form of support by fixing bars7 to the base 1, the ends of the bars extending 'beyond each edge of thebase, through which are disposed bolts or screws 8 and by which meansthe bars arel securely clamped to the supporting object.

-The faces of the plates 4 are preferably milled or roughened, or saidlates may consist of sections of files, the milled surfaces of theplates serving to remove portions of the metal constituting the bladesof the tools and thereby forming a sharp edge on the tool and the extentof the cutting edge may be readily governed by the inclination of theplates, as should a more or less keen cutting edge be desired, the upperedges of the plates 4 are moved closer to each other, while if an abruptcutting edge is desired, the upper edges of the plates are to beseparated a greater' distance than when a keen edge is desired and bymilling both faces of the plates, said plates may be reversed and theife of the plates greatly enhanced.

In view of the extreme simplicity of my improved device, it can be verycheaply constructed and the sharpening plates can be renewed from timeto time at a very nominal cost and it will further be seen that bysecuring the plates in position as shown, the extent ofthe cutting edgeofthe tools may be varied at will; v

What I claim is:

A device of the character described, comprising a spring holder havingarranged centrally therein a channel late with u wardly and outwardlyinclinedp walls, said) holder having its terminal portions formed insegmental outline,

edges, duplicate edgewise arranged sharpenwith opposed spaced apartV ingplates, the lower ends of' which are rel In testimony whereof l havesigned my oeived by said channel plete and their upper naine to thisspeoiiieation in the presence of ends engaged by the segmental portionsof l two subscribing Witnesses.

said holder, said holder also being ,equipped l ALEXANDER J. STURM. 5with holding screw bolts for the effective rel YWitnesses:

tention of said sharpening plates in position M. J. CURTIN,

in said holder. HARRY A. CURTIN.

